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Convection Answers

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1
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Where could convection currents form?

A
in a sand dune
B
on a pavement
C
in the atmosphere
D
in outer space
2
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Water is boiling in a clear pot, as shown in the picture.

Question illustration
A
They are more spread out and moving faster than those at the surface.
B
They are closer together and moving faster than those at the surface.
C
They are more spread out and moving slower than those at the surface.
D
They are closer together and moving slower than those at the surface.
3

Water is boiling in a clear pot, as shown in the picture.

Question illustration
A
Thermal energy is transferred.
B
Water molecules gain kinetic energy.
C
Chemical energy is transferred.
D
Water molecules gain thermal energy.
4

Which best describes the convection currents in Earth’s mantle?

A
They transfer potential energy away from Earth’s core toward its crust.
B
They transfer thermal energy away from Earth’s core toward its crust.
C
They transfer chemical and thermal energy in a circular pattern.
D
They transfer chemical and potential energy in a circular pattern.
5

A student places a large pot of cold water on a stove and heats it for one minute. Then she takes the pot of water off the burner and places it on the counter. Which best describes the convection currents?

A
Convection currents move thermal energy from the stove to the pot, and then from the pot to the water.
B
After the stove is turned off, convection currents continue to transfer energy through the water for a period of time.
C
Convection currents in the water cause warmer, denser water to rise and transfer energy upward.
D
When the stove is turned on, convection currents cause an increase in the chemical energy of water molecules.
6

Yami pours powdered cocoa mix into milk and stirs it. Then she microwaves the mixture for three minutes. When she takes the cup out, the handle is very warm. Steam rises from the cup, so she blows it before taking a sip. In which part of this scenario can convection be best observed?

A
stirring powdered cocoa mix into milk
B
touching the warm handle of the cup
C
rising steam from the cup of cocoa
D
pouring the cocoa mix into the milk
7

Which area of Earth is most similar to the sun’s convection zone?

A
the crust
B
the equator
C
the mantle
D
the poles
8

When Xavier places his hands near a light bulb, he notices that certain areas around the light bulb are warmer than others. Which best explains this?

A
The areas to the sides of the light bulb are warmest because of conduction.
B
The areas to the sides of the light bulb are warmest because of convection.
C
The area directly above the light bulb is warmest because of conduction.
D
The area directly above the light bulb is warmest because of convection.
9

The diagram shows the motion of a group of water molecules over a heat source.

Question illustration
A
They are farther apart.
B
They have increased in size.
C
They have lost energy.
D
They are moving slower.
10

The lava lamp has a light bulb as a heat source at its base. The lamp contains a colored, waxy fluid that can be observed moving in clumps through a clear liquid.

Question illustration
A
density
B
temperature
C
kinetic energy of its molecules
D
space between its molecules

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Convection Answers — NC-Physical Science